using System;

public class Program

{

    public static void Main()

    {

          var eventCloseTime = "4:39 PM"; //time in string

            DateTime date = DateTime.Now.Date; // get only date

            //convert time into datetime

            DateTime dateTime = DateTime.ParseExact(eventCloseTime, "h:mm tt", System.Globalization.CultureInfo.InvariantCulture);

            //add time into datetime

            var updatedDatetime = date.AddTicks(dateTime.TimeOfDay.Ticks);

          Console.WriteLine(updatedDatetime);

    }

}